Supreme Court Justice Clarence Thomas is making waves again, this time by dredging up the past and settling a few old grudges.

In his new autobiography, ìMy Grandfatherís Son,î Thomas blasts liberal groups, Yale Law School and Democratic senators like Joseph Biden, who opposed his nomination.

The book also rehashes Thomasí bitter confirmation process, in which former aide Anita Hill accused him of sexual harassment.

He compares his childhood fear of the Ku Klux Klan to his later fear of attacks ìby left-wing zealots draped in flowing sanctimony.î

If Thomas were a pop star or even a retired judge, such a self-indulgent settling of scores might be understandable.

But he is a sitting Supreme Court justice. He is charged with interpreting the Constitution, including ruling in cases that are likely to involve some of the people he has publicly attacked.